Tecumseh, it was a national poll - says that right in the article.
Angstrom, I agree that we require intelligence to survive, but it is a naturalistic fallacy to assume that this is the determinant factor for intelligence. We invariably have a higher rate of intelligent beings now than when we did when fighting to survive.
And as a society we wouldn't be too smart if we were always fighting for our survival.
What makes you think we don't have to fight for survival these days? What makes you think we live so close to nirvana today. Can't you look at the modern constant state of war and understand that we are maybe not as advanced in the humanities as you seem to believe? Thirty millions were murdered by the USA in unlawful wars since the close of the second world war. Where's the progress? If there has been progress it has been exactly in the wide distribution of dumbness plain brown paper ignorance. The movers and shakers have designed and managed it to be so. They have progressed while the rest have regressed according to plan. It's not just Americans consider Blackleaf fer instance.